Do I need new bolts or mounting hardware to install this?

You'll use your existing factory bolts and fasteners. Inspect them during removal—if they're stripped or corroded, grab fresh hardware at the same time to ensure a solid mount.

Can I reuse the old rotor and caliper with this new hub assembly?

Yes. The hub mounts to your existing brake components. If your rotor or pads are worn, replace them separately—this assembly handles the wheel bearing side only.

What if the assembly doesn't seat fully when I bolt it on?

Test-fit before fully tightening. If resistance occurs, check for debris on the mounting surface and verify you're using the correct fasteners. Refer to your vehicle's service manual for proper torque specs.